Networking not working with XP SP2

[Citizen K]

I recently upgraded my server PC from XP to XP SP2. Previously I had no problems with connecting to my LAN, but now, I lose connectivity almost every day. I often have to re-setup the Home office networking. Some times it works, sometimes it doesn't.
However, I suspect that it may have some problems with the firewall setting. Once too, I saw a Windows error message that said something about having problems with a Generic host driver.
Could someone help me out?

[Citizen K]

Windows gives me this message:
Generic Host Process for Win32 has encountered a problem and needs to close
Is it possible that the XP is corrupted?

[Spoiler]

You can try this patch and see if it helps...

http://www.microsoft.com/technet/security/bulletin/MS03-026.mspx

[Citizen K]

I downloaded the patch but it works only with regular XP, not on SP@. However, I have in the meantime solved the problem. I needed to specify the exceptions on the Firewall in order for my workstations to access the server connection.